Colored film-coated ultraviolet/infrared absorbent glass plate and window glass of vehicle

Abstract

A colored film-coated ultraviolet / infrared absorbent glass plate is formed of base glass, colorants, and a colored film. The base glass includes 65 to 80 wt. % SiO2; 0 to 5 wt. % Al2O3; 0 to 10 wt. % MgO; 5 to 15 wt. % CaO; 10 to 18 wt. % Na2O; 0 to 5 wt. % K2O; 5 to 15 wt. % total amount of MgO and CaO; 10 to 20 wt. % total amount of Na2O and K2O; 0.05 to 0.3 wt. % of SO3; and 0 to 5 wt. % B2O3. The colorants includes 0.35 to 0.55 wt. % total iron oxide (T-Fe2O3) expressed as Fe2O3; 0.08 to 0.15 wt. % FeO; 0.8 to 1.5 wt. % CeO2; and 0 to 0.5 wt. % TiO2. FeO expressed as Fe2O3 is equal to or more than 20 wt. % and less than 27 wt. % of T-Fe2O3. The colored film has a red color shade with a thickness between 30 nm and 300 nm and includes fine particles of gold and silicon oxide of more than 50 wt. % and equal to or less than 95 wt. %. The colored film is applied onto a surface of the ultraviolet / infrared absorbent glass plate.

Description

The present invention relates to an ultraviolet / infrared absorbent glass having a greenish color shade. Particularly, it relates to a colored film-coated ultraviolet / infrared absorbent glass plate prepared by applying a colored film having a red color shade onto the ultraviolet / infrared absorbent glass plate and a window glass of a vehicle employing the colored film-coated ultraviolet / infrared absorbent glass plate.BACKGROUND OF THE INVENTION AND RELATED ART STATEMENTRecently, a variety of glasses having an ultraviolet / infrared absorptivity and a greenish color shade to be used as a vehicle windshield has been proposed with the view of preventing degradation of luxurious interior materials and reducing cooling load of the vehicle.For example, an ultraviolet / infrared absorbent glass having a greenish color shade disclosed in Japanese Patent H6-88812B consists of soda-lime glass including colorants consisting of 0.65 to 1.25 wt. % total iron oxide expressed as Fe.sub.2 O.sub.3, 0.2 to...

AI Technical Summary

Benefits of technology

SiO.sub.2 is a principal component for forming skeleton of glass. Less than 65% SiO.sub.2 lowers durability of the glass and more than 80% SiO.sub.2 raises a melting temperature of the glass so high. SiO.sub.2 is comprised accordingly within a range of 65 to 80%

The raw material of fine particles of gold may be not only chloride including chloroaurate but sulfide, cyano complex, halogeno complex, thioic acid, thiosulfato acid, sulfito complex, and auric acid of gold, and organogold compound or the like. Among them, chloroauric is preferable because of its stability and ease of acquisition.

Problems solved by technology

In this case, the glass can be hardly applied with a desired coating thereon.

The efficiency of promotion of melting becomes poor when the total of Na.sub.2 O and K.sub.2 O is less than 10%, while the durability of the glass is lowered when the total of Na.sub.2 O and K.sub.2 O exceeds 20%.

When silicon oxide is contained too little, the reflectance rises excessively or the colored film becomes more blue tint because the surface prasmon absorption range of the fine gold particles shifts to the long-wave part.

When silicon oxide is contained too much, the color of the colored film becomes pale and the efficiency of the silicon oxide becomes poor.

The reflectance of the film becomes excessively high when these color controlling constituents are contained too much.

When the fine particles of gold are contained too little, the film is not sufficiently colored.

Too thin film is not sufficiently colored and too thick film reduces the durability thereof to be cracked easily.